Speaker
Description
The Cryogenic Current Comparator (CCC) was proposed and first tested as a low intensity diagnostics in the mid 90s at GSI. After proof of principle, the device was considered having high potential but also high costs and difficult handling. Nonetheless, further research work was done to optimize pickup material and operation stability. With start of the plannings for FAIR, the necessity for a nA diagnostics for slow extracted beams and exotic ions in storage rings became evident again. Since 2014 a collaboration of specialized institutes worked on the optimization of the device, with GSI and CERN being the related accelerator laboratories. In the frame of this collaboration, all relevant properties have been investigated and modified, such as magnetic shielding, pickup materials, SQUIDs and SQUID circuit and least the cryogenic support system. In parallel, commercial electronics became available, providing better performance and control than homemade SQUID electronics. During the research work different types of CCC have been invented to achieve effective shielding, highest possible current resolution and maximum system robustness. As preliminary conclusion of this work, the axial shield Dual Core CCC (DCCC) has been designed, built and successfully tested with beam. It will be installed in the FAIR transport sections and rings as well as in the CERN SPS extraction lines. In this contribution we give an overview of the development work for the CCC.
Funding Agency
work supported by BMBF under contracts 05P18RDRB1 and 05P18SJRB1
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